Delta Labs Level 1 West

Delta Labs Level 1 West
The door at the other end of the room is locked, but as you approach it an imp will bust up through the flooring behind you. Kill the imp and then drop into the hole the imp created to crawl through a shaft and into the Storage Room 21-D. As you emerge, watch for an imp behind you and then open up the storage locker with the code 298.

As you open the next door, watch out for the cacodemon that spawns behind you. There's also an imp just right of the doorway, and a revenant will spawn as you make your way down the hall. Two cacodemons will follow the revenant's demise. You can reach the upper platform to the right with some health and armor by pushing a nearby yellow block near the crate, but be careful as an imp will spawn to the right while a commando zombie comes from the left.

Go down the hall to the right to continue, where you'll find a narrow path that leads left with a cacodemon on guard. Drop down the ladder at the end of the hall but watch for the zombie to the right. There's another zombie in the dark recesses of the next wall, along with a number of shotgun shells for you to collect. Continue down the hall to open the next door, but don't run through it just yet. Let the lost souls inside the reactor room fly towards you so that you can easily blast them, one at a time.

Follow the catwalk forward to grab a clip, but watch out for the lost soul that soon appears. To the right is a large pipe you can jump to which will let you get to the upper platform to your right. Quickly run across the pipe to reach the platform where you can safely fight off the cacodemon and lost souls that appear.

On one end of this upper walkway is a door behind which is a revenant. Take care of it quickly before heading into the Delta Reactor Control room. In front of the window is a control panel you can activate to turn the reactor online. Turn around and step forward to summon an imp from your left who opens up a new pathway. Climb the ladder in the cramped area to reach an even higher platform in the main reactor room.

A pair of cacodemons will be waiting for you on the platform, as well as the PDA of Brian Mora. When you grab the PDA, a lost soul will appear behind you. With the PDA in hand, backtrack to the main control room so that you can open the previously locked door (watch out for another lost soul on the way back).

As you drop back down the ladder to the control room a commando zombie will barge in through the door to the right. Take him out, then open the door to the left and take out the imp inside. Just through another door you'll reach the Delta Service Tunnel 1, and inside is a cacodemon. Two more cacodemons will spawn in the room as you make your way down the hall to the stairway that leads to an upper walkway on the left. Open up the door at the end of the walkway and take down the commando zombie on the other side.

Call the lift in the next room and ride it down to a lower level. Turn right at the bottom of the lift to target an imp that jumps from the right, and watch out for a second imp as it comes through the next doorway. There are some shells you can grab from behind the boxes to the right before exiting the room. There's also some ammo under the stairs in the next room which you'll want to grab before heading upstairs to take out the commando zombie from around the corner.

There's a lone zombie in the next room, along with some ammo and a health station. There's even a suit of armor hidden under the flooring (grab it by dropping onto the pipes below). Take the elevator up to the next level and shoot down the pink that's just left of the elevator's exit. There's also an imp in this looping hallway, along with some rockets. Grab the gear and ready your rocket launcher as you open the doorway to the right. You'll be introduced to your first archvile and you don't want to take the encounter lightly. Archviles will continue to spawn enemies around you until they're destroyed, so quickly target the archvile with your rocket launcher and blast it away. When the area is clear, step back into the room to continue to the next stage.